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A rightward shift in the visuospatial attention vector with healthy aging.

Christopher S Y Benwell1, Gregor Thut2, Ashley Grant3

  • 1Centre for Cognitive Neuroimaging, School of Psychology, University of Glasgow Glasgow, UK ; School of Psychology, University of Glasgow Glasgow, UK.

Frontiers in Aging Neuroscience
|June 25, 2014
PubMed
Summary

Healthy aging shifts visuospatial attention, reducing the typical leftward bias (pseudoneglect). Elderly individuals show a rightward shift, especially with shorter stimuli, suggesting altered right hemisphere dominance for attention.

Keywords:
aginghemispatial neglectlandmark tasklateralizationline bisectionpseudoneglectspatial biasvisuospatial attention

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Human Behavior

Background:

  • Lateralized visuospatial attention bias, known as pseudoneglect, typically favors the left visual field.
  • This bias is linked to right hemisphere dominance for visuospatial processing.
  • Pseudoneglect is modulated by age, with elderly individuals often showing reduced or reversed bias.

Purpose of the Study:

  • To investigate age-related shifts in visuospatial attention bias.
  • To examine the influence of stimulus properties (line length) on this bias in young and elderly adults.
  • To explore the underlying neural mechanisms, specifically hemispheric dominance changes.

Main Methods:

  • Computerized landmark task assessing subjective midpoint judgment across varying line lengths.
  • Comparison of performance between healthy young and elderly participants.
  • Analysis of attentional bias shifts and performance precision.

Main Results:

  • Both age groups exhibited a rightward shift in subjective midpoint with decreasing line length.
  • Elderly participants showed a significant rightward bias for the shortest line length (1.98° VA).
  • Overall task precision was lower in elderly participants, indicating reduced discrimination sensitivity.

Conclusions:

  • Healthy aging is associated with a rightward shift in the attentional vector, likely due to reduced right hemisphere dominance.
  • The findings suggest potential hemispheric functional reorganization in aging.
  • A reversal of hemisphere dominance favoring the left hemisphere may occur in elderly individuals under specific conditions.